Malicious PDF — malware analysis report

Static analysis result for SHA-256 646ba3816cfae96e…

MALICIOUS

PDF

74.5 KB Created: 2020-12-19 01:27:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a45f6ab596a21ca0501cddc50ee2d2c6 SHA-1: d195af4760aac895a654aa494217cd8c69c3bd73 SHA-256: 646ba3816cfae96e91bfe5661e1a97a9daf2ed0d1a511983e083069981609a62
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafftec.ru/123?utm_term=cuales+son+las+fiestas+y+ceremonias+de+los+otomies PDF link annotation
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/tizojup_bodikitoteriv.pdfIn PDF document text
    • https://siminanora.weebly.com/uploads/1/3/4/6/134611077/33afd13078.pdfIn PDF document text
    • https://gazofifato.weebly.com/uploads/1/3/4/4/134496451/fezajalipu-firijekigivi-wowik.pdfIn PDF document text
    • https://bizowubojixix.weebly.com/uploads/1/3/4/2/134265373/vunurudivap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494136/normal_5fd97810e161c.pdfIn PDF document text
    • https://xutonipojoneri.weebly.com/uploads/1/3/4/6/134667901/kumanilupa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5fc603b213b52.pdfIn PDF document text
    • https://zuwanefo.weebly.com/uploads/1/3/4/0/134040462/golopubejut_gotupupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_5fc213e46dc26.pdfIn PDF document text
    • https://sizukejagu.weebly.com/uploads/1/3/2/6/132681884/5716643.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4f2670a2757459bfcd987/t/5fc634849d7936484060875a/1606825101825/nejes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 5176 bytes
SHA-256: 1774cf78b06462ba0618d94820651b9f9f827400133d08e870f4222843b7f485
font_01_sfnt_off0000f6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 11068 bytes
SHA-256: 528448f226e70df5458b4dea824148b1a9d06082da94990796227a541a49a1f0

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